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[ahy-suh-tohn] /ˈaɪ səˌtoʊn/

noun, Physics.
one of two or more atoms having an equal number of neutrons but different atomic numbers.
one of two or more atoms of different atomic number that contain the same number of neutrons

isotone i·so·tone (ī’sə-tōn’)
One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons.


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